[tor-bugs] #20596 [Metrics]: streamline build.xml and metrics_checkstyle.xml throughout all java projects

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#20596: streamline build.xml and metrics_checkstyle.xml throughout all java
projects
-------------------------+------------------------------
 Reporter:  iwakeh       |          Owner:  iwakeh
     Type:  enhancement  |         Status:  needs_review
 Priority:  Medium       |      Milestone:
Component:  Metrics      |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
 Reviewer:               |        Sponsor:
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Comment (by iwakeh):

 So, three more commits on [https://gitweb.torproject.org/user/iwakeh
 /metrics-base.git/?h=task-20596 my branch of metrics-base].  (And, what is
 good, nowhere else!)

 The JDK version was supposed to be included in the manifest (making
 reproducing builds easier).  Thus, I added `Implemented-By: The Tor
 Project` and left `Created-By: ...` to refer to the JDK as it usually
 does.  Hope, this is fine.

 Other changes:  make all three tar tasks work and only add Main-Class to
 the appropriate executable jar.

 I tested by brute-force sub-repo replacement and it worked.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20596#comment:39>
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